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    Revert "cgroup: remove redundant variable in cgroup_mount()" · e756c7b6
    Zefan Li 提交于
    This reverts commit 0c7bf3e8.
    
    If there are child cgroups in the cgroupfs and then we umount it,
    the superblock will be destroyed but the cgroup_root will be kept
    around. When we mount it again, cgroup_mount() will find this
    cgroup_root and allocate a new sb for it.
    
    So with this commit we will be trapped in a dead loop in the case
    described above, because kernfs_pin_sb() keeps returning NULL.
    
    Currently I don't see how we can avoid using both pinned_sb and
    new_sb, so just revert it.
    
    Cc: Al Viro <viro@ZenIV.linux.org.uk>
    Reported-by: NAndrey Wagin <avagin@gmail.com>
    Signed-off-by: NZefan Li <lizefan@huawei.com>
    Signed-off-by: NTejun Heo <tj@kernel.org>
    e756c7b6
cgroup.c 148.0 KB